Fig. 4.
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Combined background-subtracted 2−10 keV light curves detected by MOS1, MOS2, and PN during the flaring activity of the August 31, 2019, observation (5400−12 000 s). The soft (2−5 keV) and hard (5−10 keV) bands are shown, and the hardness ratio (hard/soft) is overplotted (see the right-hand axis). The temporal evolution of the hardness ratio indicates spectral variability during the flare.
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